When to find and how to identify the three whales that regularly visit the California coast.
If you go into the woods and listen, you may hear great horned owl duets, the trill of western screech owls, toots of northern saw-whet owls, or the daytime call of the northern pygmy owl.
Try tracking a single iris over time.
Three subspecies of chestnut-backed chickadee inhabit the Bay Area. But the populations are merging.
See evidence of “gravitational wasting” erosion on Bay Area hillsides.
Vetch and Argentine ants cooperate, exchanging food for protection.
A quiet winter woodland can suddenly explode with bird life. Jack Laws explains how to tell some of the common species apart.
Native to China, Craspedacusta sowerbii is found in freshwater lakes and ponds on every continent.